espocrm-base/application/Espo/Modules/Crm/Resources/metadata/clientDefs/Calendar.json

{
    "colors": {
        "Meeting": "#558BBD",
        "Call": "#CF605D",
        "Task": "#76BA4E"
    },
    "scopeList": ["Meeting", "Call", "Task"],
    "allDayScopeList": ["Task"],
    "modeList": ["month", "agendaWeek", "agendaDay", "timeline"],
    "canceledStatusList": ["Not Held", "Canceled"],
    "completedStatusList": ["Held", "Completed"],
    "additionalColorList": ["#AB78AD", "#CC9B45"],
    "iconClass": "far fa-calendar-alt"
}